CN102510083A - Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement - Google Patents
Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement Download PDFInfo
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Abstract
The invention belongs to the technical field of the electric power system and the wind power field grid-connection, in particular to an integration protection method capable of reducing the wind power field low-voltage crossing capacity, comprising the following steps: using a current protection criterion to realize the identification of a fault line, measuring a phase voltage U Phi of a bus line of a wind power field grid-connection transformer station for a voltage protection criterion, calculating the voltage sag amplitude value percent value V lower than low-voltage crossing stable value(90% rated voltage value); if the V value is larger than or equal to 70, the II section current protection delay is canceled by the voltage protection criterion; if the V value is smaller than 70, the current protection delay on the fault line is adjusted at the real time by the voltage protection criterion, thus the relationship between the failure cut time formed by the current protection delay time and the line breaker action intrinsic time and the V value is as follow: (V2+1707)*t=5081, wherein 0.6<=t<=4. The wind power field low-voltage crossing capacity is increased on the system level, the implementation is simple and the cost is low; simultaneously the safety operation of the wind electric machine set and the electric power system is protected.
Description
Technical field
The invention belongs to electric power system and wind farm grid-connected field, particularly a kind ofly reduce the integration protection method that the wind energy turbine set low-voltage is passed through capacity requirement.
Background technology
According to the requirement of electric power system industry standard, big capacity is wind farm grid-connected must possess certain low voltage ride-through capability, in grid-connected system fault etc. certain voltage and idle support is provided in emergency circumstances.Low voltage ride-through capability is mainly reflected in two key indexs: electric voltage dropping amplitude and duration.The inducement that serious electric voltage dropping takes place in the electric power system is all caused by electric power system fault basically; Relaying protection is the technology that electric power system realizes fault detect, excision; Therefore the operating characteristics of relaying protection will directly determine the duration of electric voltage dropping; Thereby influence the requirement that electric power system is passed through capacity to the low-voltage of grid connected wind power field wind-powered electricity generation unit.
The research of carrying out at present to the raising low voltage ride-through capability of wind turbine generator system mainly is to realize from the control strategy of adjustment wind-powered electricity generation unit current transformer.But the restriction of wind-engaging group of motors current transformer capacity or the power electronic device design parameter that adopted; Under the degradation failure situation; The control strategy of wind-powered electricity generation unit current transformer will lose efficacy and can only use crowbar (Crowbar) protection, with rotor short-circuit, can't realize necessary low voltage ride-through capability.At present to the control strategy research and the application of wind-powered electricity generation unit current transformer, be to launch to the blower fan individuality particularly, actual needs is studied and is used to every typhoon machine, and cost is very high; And because the individual otherness of blower fan, and in the wind energy turbine set because the skewness of reactive power weighing apparatus, having caused adopting the mode of wind-powered electricity generation unit current transformer control strategy to improve wind energy turbine set wind-powered electricity generation unit low-voltage, to pass through the effect of capacity not good.
In fact; When conventional wind-powered electricity generation unit current transformer low-voltage is passed through the control strategy inefficacy under the degradation failure situation; If the extent of injury that the wind farm grid-connected place of ability identification busbar voltage is fallen, self adaptation is adjusted corresponding relaying protection operating characteristics, shortens fault clearing time; Then will wholely effectively reduce the electric voltage dropping duration that wind energy turbine set wind-powered electricity generation unit is experienced, thereby reduce capacity is passed through in electric power system to the wind energy turbine set low-voltage requirement; Be equipped with wind-powered electricity generation unit low-voltage conventional, the low capacity demand this moment again and pass through control strategy, the good low-voltage of grid connected wind power field is passed through realizing.
But the two-period form current protection of just configuration routine comprises I section transient current fast tripping protection, II section overcurrent protection on the present wind farm grid-connected transformer station current collection circuit.The time-delay of I section transient current fast tripping protection attonity, fault clearing time depends primarily on the intrinsic operate time of circuit breaker, and the time is between 150 milliseconds-200 milliseconds; But the protection range of I section current protection is merely about 30% of total track length.Most of fault on the circuit needs the excision of II section overcurrent protection; II section current protection needs deferred action, and time-delay will be according to topological structure and the adjacent lines or the transformer fiting tuning of The field, and time-delay is generally at 1.5-3 about second; For a long time time-delay causes the duration of electric voltage dropping very long, and it is also just very high that the low-voltage of grid connected wind power field wind-powered electricity generation unit is passed through capacity requirement.
What wind-powered electricity generation unit low-voltage was passed through reaction mainly is the low-voltage index; If therefore can combine the low-voltage index effectively; Consider the two-period form overcurrent protection that generally adopts at present simultaneously; The demand that the selectivity of compatible electric power system fault is isolated and wind energy turbine set wind-powered electricity generation unit low-voltage is passed through capacity effectively then will realize reducing the requirement to grid connected wind power field low voltage ride-through capability of wind turbine generator system from the electric power system aspect.
Compatible from the low-voltage index of bus measurement with to each overcurrent index at interval, the conventional protection according to arranged spaced is difficult to realize; But fast-developing at present can realize a cover protective relaying device, and the current information of multi-compartment and the integrated protection platform of the whole transformer station of busbar voltage information protection provide application foundation for addressing this problem in the acquisition station.
Summary of the invention
The objective of the invention is for overcoming above problem, proposed a kind of integration protection method that the wind energy turbine set low-voltage is passed through capacity requirement that reduces; The present invention possesses the function that system level improves the wind energy turbine set low voltage ride-through capability, and realization is simple, cost is low; The ability that possesses protection wind-powered electricity generation unit and safe operation of power system simultaneously.
The present invention proposes a kind ofly reduces the integration protection method that the wind energy turbine set low-voltage is passed through capacity requirement, comprises voltage protection criterion and current protection criterion two parts; Concrete steps are following:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ representes A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i representes i at interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the current protection criterion to realize the identification to faulty line, after failure judgement took place, if I section current quick moves instantaneous tripping operation, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is confirmed by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦCalculating is lower than the electric voltage dropping amplitude percent value V that low-voltage is passed through stationary value (90% load voltage value); Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section current protection more than or equal to 70, the II segment protect on the fault current collection circuit does not have deferred action excision fault;
If the V value, is then adjusted the time-delay of II section current protection in real time less than 70, make to add that by the current protection time-delay fault clearing time and V value size that the circuit breaker action intrinsic time is formed keep relation to be: (V
2+ 1707) t=5081,0.6≤t≤4 wherein, the protection action on the acceleration disturbance current collection circuit.
Characteristics of the present invention and beneficial effect:
The inventive method is based on the wind-force unit low voltage ride-through capability standard of industry standard regulation; Based on traditional transformer station's integrated protection platform; Comprise towards the voltage protection criterion of full transformer station with towards the current protection criterion of monospace; The current protection criterion adopts traditional protection criterion and setting method, has proposed to possess the under-voltage protection operating characteristics of inverse time characteristic simultaneously; Increased and considered that the wind energy turbine set low-voltage passes through the voltage protection criterion that industry standard requires and quicken each traditional current protection criterion fast trip excision fault at interval; Thereby reduce grid connected wind power field blower fan low-voltage is passed through the requirement of capacity, and improve wind farm grid-connected operation characteristic.
The present invention possesses the function that system level improves the wind energy turbine set low voltage ride-through capability, and realization is simple, cost is low; The ability that possesses protection wind-powered electricity generation unit and safe operation of power system simultaneously.
Description of drawings
Fig. 1 is the voltage protection criterion characteristic of the inventive method.
Fig. 2 is for using the grid connected wind power field sketch map of the inventive method.
Embodiment
The present invention proposes a kind ofly reduces the integration protection method that the wind energy turbine set low-voltage is passed through capacity requirement, comprises voltage protection criterion and current protection criterion two parts; Concrete steps are following:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ representes A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i representes i at interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the current protection criterion to realize the identification to faulty line, after failure judgement took place, if I section current quick moves instantaneous tripping operation, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is confirmed by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦCalculating is lower than the electric voltage dropping amplitude percent value V that low-voltage is passed through stationary value (90% load voltage value); Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section current protection more than or equal to 70, the II segment protect on the fault current collection circuit does not have deferred action excision fault;
If the V value, is then adjusted the time-delay of II section current protection in real time less than 70, make to add that by the current protection time-delay fault clearing time and V value size that the circuit breaker action intrinsic time is formed keep relation: (V
2+ 1707) t=5081, wherein 0.6≤t≤4 are as shown in Figure 1, and curve maximum V=80 appears at 0.6 second and locates among the figure; Curve minimum V=0 appears between 2.98 seconds to 4 seconds; Protection action on the acceleration disturbance current collection circuit.
To grid connected wind power shown in Figure 2 field, the embodiment of the inventive method specifies as follows:
A wind energy turbine set wind-powered electricity generation group of planes 1 is connected to the 35kV bus of wind farm grid-connected transformer station among Fig. 2 through current collection circuit 1; A wind energy turbine set wind-powered electricity generation group of planes 2 is connected to the 35kV bus of wind farm grid-connected transformer station through current collection circuit 2; A wind energy turbine set wind-powered electricity generation group of planes 3 is connected to the 35kV bus of wind farm grid-connected transformer station through current collection circuit 3.Wind farm grid-connected transformer station is through the access electric power system of boosting of 35kV/110kV transformer station.
Utilization is installed in existing transformer station integrated protection Platform Implementation the inventive method in the wind farm grid-connected transformer station; Current protection criterion wherein is directed against any in three intervals (current collection circuit 1, current collection circuit 2, current collection circuit 3) in the transformer station; Measure the three-phase current
at this interval; And dispose traditional two-period form current protection, i.e. I section-transient current fast tripping protection, II section-overcurrent protection.Use the busbar voltage amplitude of the integrated protection platform measuring 35kV of transformer station of patent of the present invention simultaneously, be used for the voltage protection criterion of integrated protection.
The current value that passes through when the action definite value of I section-transient current fast tripping protection greater than protected circuit under maximum operational mode is terminal three-phase shortcircuit takes place, time delays is 0 second; The action definite value of II section-overcurrent protection is greater than the maximum load current value of protected circuit, and time delays adopts staged to cooperate with adjacent lines, generally at 1.5-3 about second.
Like circuit among Fig. 21 is example, transformer station's integrated protection of supposing to use the inventive method after the current protection criterion of circuit 1 is adjusted according to conventional method, the I section under normal operating mode the protection circuit total length 50%, time delays is 0 second; The action delay of II section was at 3 seconds.
A, B double earthfault if take place at circuit 1 apart from circuit top total length 85% place in this moment; The wind farm grid-connected A of transformer station phase, B phase voltage drop to 35% of rated value after the fault; Transformer station's integrated protection of then using patent of the present invention starts greater than setting value towards the current protection criterion of circuit 1; Because the line fault distance has exceeded the protection range of I section current protection, can only be by the action of II segment protect, the 3 seconds tripping operation excision faults of delaying time.
But fault phase A phase, B phase voltage drop to 35% of rated value; Then start the voltage protection criterion of using the inventive method; Substation bus bar phase voltage
and calculating V are incorporated into the power networks after the measurement fault:
V=55＜70; Then voltage protection criterion is adjusted the time-delay of II section current protection in real time; Voltage protection criterion characteristic according to the inventive method shown in Figure 1; The II section current protection time-delay of circuit 1 will be adjusted into 1 second, and the protection would trip of acceleration disturbance current collection circuit 1 has reduced electric power system the wind energy turbine set low-voltage is passed through performance demands.
Claims (1)
1. one kind is reduced the integration protection method that the wind energy turbine set low-voltage is passed through capacity requirement, comprises voltage protection criterion and current protection criterion two parts; Concrete steps are following:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ representes A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i representes i at interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the current protection criterion to realize the identification to faulty line, after failure judgement took place, if I section current quick moves instantaneous tripping operation, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is confirmed by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦCalculating is lower than the electric voltage dropping amplitude percent value V that low-voltage is passed through stationary value (90% load voltage value); Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section current protection more than or equal to 70, the II segment protect on the fault current collection circuit does not have deferred action excision fault;
If the V value, is then adjusted the time-delay of II section current protection in real time less than 70, make to add that by the current protection time-delay fault clearing time and V value size that the circuit breaker action intrinsic time is formed keep relation to be: (V
2+ 1707) t=5081,0.6≤t≤4 wherein, the protection action on the acceleration disturbance current collection circuit.
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| CN 201110347316 CN102510083B (en) | 2011-11-07 | 2011-11-07 | Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement |
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Cited By (11)
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| CN102832603A (en) * | 2012-09-18 | 2012-12-19 | 山东电力集团公司济宁供电公司 | Quick junctor fault isolation method compatible to low-voltage ride through operation of photovoltaic power station |
| CN103414171A (en) * | 2013-04-16 | 2013-11-27 | 清华大学 | Method for protecting whole-line rapid-cutting and optimizing reclosure of current collection line |
| CN104316788A (en) * | 2014-10-16 | 2015-01-28 | 国家电网公司 | Method for judging tripping of outgoing line of double-feed wind turbine generator |
| CN105914717A (en) * | 2016-04-13 | 2016-08-31 | 国网江苏省电力公司经济技术研究院 | Wind power station feed line current protecting method matched with LVRT |
| CN106451543A (en) * | 2016-11-01 | 2017-02-22 | 清华大学 | Method for flexibly simulating low-voltage ride-through output characteristics of wind generation sets |
| CN107994549A (en) * | 2017-12-20 | 2018-05-04 | 国网江西省电力有限公司电力科学研究院 | The definite method of distribution line low-voltage circuit breaker low-voltage protection delay time |
| CN108429246A (en) * | 2018-03-29 | 2018-08-21 | 内蒙古电力勘测设计院有限责任公司 | A kind of wind power plant current collection line protection method and device |
| CN108879798A (en) * | 2018-07-04 | 2018-11-23 | 广东电网有限责任公司 | A kind of excessively method of flow control and system, equipment, the medium anti-error based on Sudden Changing Rate |
| CN111276931A (en) * | 2020-02-18 | 2020-06-12 | 广东电网有限责任公司电力调度控制中心 | New energy peripheral alternating current line protection fixed value checking method, system and equipment |
| CN111884256A (en) * | 2020-07-31 | 2020-11-03 | 国网经济技术研究院有限公司 | High voltage ride through method and system for new energy unit |
| CN113095741A (en) * | 2021-05-21 | 2021-07-09 | 中国电力科学研究院有限公司 | Method and device for planning grid-connected capacity of power electronic power supply |
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| CN102832603B (en) * | 2012-09-18 | 2016-09-07 | 国网山东省电力公司济宁供电公司 | The quick fault of interconnected transmission line partition method that a kind of compatible photovoltaic plant low voltage crossing runs |
| CN102832603A (en) * | 2012-09-18 | 2012-12-19 | 山东电力集团公司济宁供电公司 | Quick junctor fault isolation method compatible to low-voltage ride through operation of photovoltaic power station |
| CN103414171A (en) * | 2013-04-16 | 2013-11-27 | 清华大学 | Method for protecting whole-line rapid-cutting and optimizing reclosure of current collection line |
| CN103414171B (en) * | 2013-04-16 | 2015-09-30 | 清华大学 | The protection of current collection circuit cut rapidly completely and optimization reclosing method |
| CN104316788A (en) * | 2014-10-16 | 2015-01-28 | 国家电网公司 | Method for judging tripping of outgoing line of double-feed wind turbine generator |
| CN105914717A (en) * | 2016-04-13 | 2016-08-31 | 国网江苏省电力公司经济技术研究院 | Wind power station feed line current protecting method matched with LVRT |
| CN105914717B (en) * | 2016-04-13 | 2018-04-10 | 国网江苏省电力公司经济技术研究院 | The wind power plant current protection method of feeder line coordinated with LVRT |
| CN106451543B (en) * | 2016-11-01 | 2018-11-23 | 清华大学 | A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics |
| CN106451543A (en) * | 2016-11-01 | 2017-02-22 | 清华大学 | Method for flexibly simulating low-voltage ride-through output characteristics of wind generation sets |
| CN107994549A (en) * | 2017-12-20 | 2018-05-04 | 国网江西省电力有限公司电力科学研究院 | The definite method of distribution line low-voltage circuit breaker low-voltage protection delay time |
| CN108429246A (en) * | 2018-03-29 | 2018-08-21 | 内蒙古电力勘测设计院有限责任公司 | A kind of wind power plant current collection line protection method and device |
| CN108879798A (en) * | 2018-07-04 | 2018-11-23 | 广东电网有限责任公司 | A kind of excessively method of flow control and system, equipment, the medium anti-error based on Sudden Changing Rate |
| CN108879798B (en) * | 2018-07-04 | 2021-07-02 | 广东电网有限责任公司 | Over-current control method, system, equipment and medium for preventing error based on mutation |
| CN111276931A (en) * | 2020-02-18 | 2020-06-12 | 广东电网有限责任公司电力调度控制中心 | New energy peripheral alternating current line protection fixed value checking method, system and equipment |
| CN111884256A (en) * | 2020-07-31 | 2020-11-03 | 国网经济技术研究院有限公司 | High voltage ride through method and system for new energy unit |
| CN111884256B (en) * | 2020-07-31 | 2021-09-28 | 国网经济技术研究院有限公司 | High voltage ride through method and system for new energy unit |
| CN113095741A (en) * | 2021-05-21 | 2021-07-09 | 中国电力科学研究院有限公司 | Method and device for planning grid-connected capacity of power electronic power supply |
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